target/s390x: implement mvcos instruction
This adds support for the MOVE WITH OPTIONAL SPECIFICATIONS (MVCOS)
instruction. Allow to enable it for the qemu cpu model using
qemu-system-s390x ... -cpu qemu,mvcos=on ...
This allows to boot linux kernel that uses it for uacccess.
We are missing (as for most other part) low address protection checks,
PSW key / storage key checks and support for AR-mode.
We fake an ADDRESSING exception when called from problem state (which
seems to rely on PSW key checks to be in place) and if AR-mode is used.
user mode will always see a PRIVILEDGED exception.
This patch is based on an original patch by Miroslav Benes (thanks!).
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20170614133819.18480-3-david@redhat.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c
index 478bcc6..c3a4ce6 100644
--- a/target/s390x/cpu_models.c
+++ b/target/s390x/cpu_models.c
@@ -682,6 +682,7 @@
S390_FEAT_LONG_DISPLACEMENT_FAST,
S390_FEAT_ETF2_ENH,
S390_FEAT_STORE_CLOCK_FAST,
+ S390_FEAT_MOVE_WITH_OPTIONAL_SPEC,
S390_FEAT_GENERAL_INSTRUCTIONS_EXT,
S390_FEAT_EXECUTE_EXT,
S390_FEAT_STFLE_45,
